JPH0756366Y2 - Work machine link connecting pin device - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a connecting pin device for a mechanical operation link that performs a posture operation of a work machine mounted on the tip side of a work machine lifting arm such as a power shovel.

[Conventional technology]

FIG. 1 shows a link device at the tip of a working machine of a power shovel, and a bucket 2 is pivotally connected to a tip of an arm 1 by a pin 3. One end of the tilt lever 4 is connected to the arm 1 by a pin 5, and the other end is connected to a tilt rod 6 whose one end is connected to the bucket 2 by a pin 7 and also to a return hydraulic cylinder 9. When the return cylinder 9 is operated, the bucket 2 is moved up and down. Hereinafter, the coupling pin device will be described by taking the cross section AA of FIG. 1 as a representative. FIG. 9 shows a conventional connecting pin device for a work implement link. The tilt levers 4'R, 4'L are formed into a pair of links with a space therebetween, and pin boss portions 12'R, 12'L for fitting the pin 5'at the coaxial center position are provided at one ends of the pair of links. Set up. A cylindrical pin boss 10 'provided at the tip of the arm 1 is inserted between these pin bosses 12'R, 12'L. A bush 11 'is fitted on the pin boss portion 10'. After aligning the pin holes of the bush 11 'fitted in these pin boss portions 12'R, 12'L and 10', the pin 5'is inserted into this and fixed to the pin boss portion of the link by the bolt 40, and tilted. A structure in which the levers 4'R and 4'L and the arm 1 are articulated is generally used.

[Problems to be solved by the device]

In the above conventional structure, the inner diameter of the pin bosses 12'R, 12'L and the bush 11 'is made larger than the outer diameter of the pin 5'to facilitate the fitting and withdrawing of the pin. I am trying to become. Therefore, there is looseness in the radial direction R at the connecting pin portion. Further, even when the pin boss 10 'is inserted between the pin bosses 12'R, 12'L, the inner width between the pin bosses 12'R, 12'L is set so as not to interfere with the link processing and assembly error. The size is made larger than the outer width size of the pin boss portion 10 '. Therefore, the pin boss portion 10 'has a play in the axial direction S which slides in the width direction of the pin 5'. Such clearance play in the joint joint (the above-mentioned play) remains as a motion inertia every time the working machine that connects and operates the mechanical operation link is lowered or raised or the operation is stopped in the left-right direction. It is the cause. Further, even if the operation of the mechanical operation link is stopped, the motion inertia in the direction of rotation around the pin of the working machine cannot be restrained due to the play of the joint joint part, and the swaying of the working machine does not stop in a short time. It causes trouble.

The present invention has been made in view of the above problems, and eliminates radial and axial gap play in the pin joint connection part of the mechanical actuating link and suppresses inertial motion in the rotational direction to generate rattling noise. It is an object of the present invention to provide a connecting pin device for a work implement link that does not cause fluttering to stop in a short time.

[Means for Solving the Problems]

In order to achieve the above object, in the coupling pin device for a working machine link according to the present invention, in the joint coupling pin device for a mechanical actuation link according to the first invention, a pin boss portion of one link to be coupled by a pin and V that distributes thrust in the axial and radial directions between the opposing end surfaces of the pin boss of the link
A thrust distribution forming part of the die is provided, and a V-shaped surface that matches the V-shaped thrust distribution forming part is formed on the inner circumference, and the V-shaped angle of the V-shaped surface is formed by the thrust distribution forming of the pin boss portion. It is characterized in that an annular elastic body having a larger angle than the V-shaped angle of the portion is housed in the thrust distribution forming portion. In the second invention, the annular elastic body is rigidly elastic inside the elastic annular body made of a non-metallic material. The third invention is characterized in that the annular member is embedded, and the third invention is characterized in that the elastic annular body is provided with lips for preventing mud intrusion.

[Action]

According to the above configuration, a V-shaped thrust distribution forming portion is provided on the opposite end faces of the links to be coupled, and the annular elastic body having the V-shaped inner periphery formed with a larger angle than the V-shaped is accommodated. By applying a force in the axial direction to the opposing end faces of the elastic annular body, the elastic annular body is deformed by receiving a force by the thrust distribution forming portion
A large thrust force is generated in the axial direction and the radial direction by the repulsive force. Further, since the rigid elastic ring member is embedded inside the elastic ring body made of a non-metallic material, the rigid elastic ring member expands in the radial direction by the thrust force in the radial direction, and the reaction force causes the rigid elastic ring member to move in the axial direction and the radial direction of the elastic ring body. Thrust will be even greater. Furthermore, since the elastic annular body is provided with lips on both sides, it is possible to prevent intrusion of mud or the like from the outside.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a sectional view taken along the line AA of FIG. 1, in which the tilt levers 4R and 4L are formed as a pair of spaced links, and the pin 5 is fitted to one end of the pair of links at the coaxial position. Pin boss portions 12R and 12L are provided, and these pin boss portions 1
Cylindrical pin boss 10 provided at the tip of arm 1 between 2R and 12L
Insert. A bush 11 is fitted on the pin boss 10. After aligning the pin bosses 12R and 12L and the pin holes of the bush 11 of the pin boss 10, the pin 5 having the plate 13 fixed to one end is fitted into the pin hole and fixed to the pin boss 12L by the bolt 14. A grease nipple 18 for greasing is attached to the pin 5. The pin boss 10 is rotatable with respect to the pin 5. The fit between the pin bosses 12R, 12L and the pin hole of the bush 11 and the pin 5 has a dimensional relationship with a clearance for facilitating the assembling, and a play is provided in the radial direction R. A plate 15 is fixed to the pin boss 12R by a bolt 17, and a shim 15a is mounted between the pin 5 and the plate 15.
The distance from 2L can be adjusted by the shim 15a. A thrust distribution forming portion 20 is formed on the end faces of the pin bosses 12R, 12L and the pin boss 10 which face each other, and accommodates the elastic annular body 30. FIG. 3 shows the thrust distribution forming unit 20, which has opposed end faces 25, 26.
Is provided with V-shaped thrust distribution forming surfaces 21 and 22 for distributing thrust in the axial direction S and the radial direction R, and parallel portions 23 and 24 parallel to the end surface are provided near the outer periphery of the pin boss. There is. FIG. 4 is a cross-sectional view of the elastic annular body 30. For example, a V-shaped surface 32 including a protruding portion 33 is formed on the inner periphery of an annular main body 31 made of an elastic non-metallic material such as rubber. A lip 34 is provided on the. The V-shaped surface 32 is provided with one or more grooves 35 for releasing grease. The groove 35 is not necessary when the bush 11 is a non-greasing type. A rigid elastic annular member 36 made of an elastic metal material such as spring steel is embedded in the annular body 31 as shown in FIG. The rigid elastic annular member 36 is unnecessary when only the annular body made of a non-metallic material sufficiently fulfills the function. The angle Y formed by the V-shaped surface 32 of the elastic annular body 30 is larger than the angle X formed by the thrust distribution forming surfaces 21, 22 of the pin boss.

Next, the setting situation and operation will be described. When the elastic annular body 30 is in the free state, as shown in FIG.
The protrusion 33 of 30 is the gap L1 between the parallel portions 23 and 24 of the pin bosses 10 and 12.
Is wider than the width W of the protrusion 33, the pin bosses 12, 10
It contacts the thrust distribution forming surfaces 21 and 22 of. Next, a force F1 shown in FIG. 7 is applied to the pin boss by the bolt 16 to narrow the gap L2 between the parallel portions 23 and 24 of the pin boss until it becomes equal to the width W of the elastic annular body. It is pressed by the forming surfaces 21 and 22 to be deformed, and the thrust is formed by the elastic force.
A force is applied in the B1 direction of 1,22. In this case, V of the elastic annular body 30
Since the angle of the shape surface 32 is made larger than the angle formed by the thrust distribution forming surfaces 21 and 22, the deformation amount in the vicinity of the protrusion 33 becomes large and a large elastic force is generated. At the same time, the elastic annular body 30 expands in the Z direction by the reaction force of the vertical component force of the B1 direction force. That is, the rigid elastic annular member 36 is also expanded to generate a repulsive force in the D direction in FIG. 5, and a strong force B1 is generated as the entire elastic annular body. When the bolt 16 is further tightened and a force F2 is applied to make the distance L3 between the parallel portions 23 and 24 of the pin boss smaller than the width W of the protrusion 33 of the elastic annular body 30 as shown in FIG. 8, the protrusion 33 is deformed. An elastic force C is generated in the axial direction. At the same time, the amount of deformation of the protrusion 33 in contact with the thrust distribution forming portion is further increased, and a larger elastic force B2 is generated. The set is completed in this state,
Pin boss 10 against pin 5 by the vertical component of elastic force B2
The centering action is performed to suppress the rattling in the radial direction, the rattling in the axial direction S by the horizontal component force of the elastic forces C and B2 in the axial direction, and the frictional resistance between the elastic annular body and the pin boss. Suppresses the fluctuation in the rotation direction. The groove 35 has the passage E secured even in the state shown in FIG.
The corner F of 34 is in contact with the parallel portions 23 and 24 of the pin boss to prevent intrusion of mud or the like from the outside. When the elastic annular body is worn or creeps and its effectiveness is reduced, the shim 15a is removed and the bolt 16 is tightened for adjustment.

[Effect of device]

As described in detail above, the connecting pin device for the working machine link according to the present invention has the following effects.

(1) Eliminates axial play in the joint connecting pin,
The rattling sound can be turned off.

(2) With respect to the play in the radial direction at the joint coupling pin portion, the centering action is performed by the elastic force of the elastic annular body, and the vibration due to the play can be suppressed and the rattling noise can be eliminated.

(3) Fluctuations due to inertia in the rotation direction of the working machine at the joint coupling pin portion can be stopped in a short time by frictional resistance.

(4) Since the rigid elastic ring member is embedded in the elastic ring body, a large elastic force can be obtained with a small volume.

[Brief description of drawings]

 Fig. 1: External view of the working machine tip of power shovel Fig. 2: Cross-sectional view of connecting pin device of the present invention Fig. 3: Cross-sectional view of thrust distribution forming part of the present invention Fig. 4: Elasticity of the present invention Sectional view of annular body Figure 5: Perspective view of rigid elastic annular member Figure 6: Sectional view of first stage when setting elastic annular body Figure 7: Sectional view of second stage when setting elastic annular body 8 Fig .: Cross-sectional view of elastic ring set completed Fig. 9: Cross-sectional view of conventional coupling pin device 1 …… Arm 4R, 4L …… Tilt lever 5 …… Pin 10,12R, 12L …… Pin boss 11 …… Bush 13,15 …… Plate 14,16,17 …… Bolt 20 …… Thrust force forming part 21,22 …… Thrust force forming surface 23,24 …… Parallel part 25,26 …… Opposite end face 30 …… Elasticity Annular body 31 …… Annular body 32 …… V-shaped surface 33 …… Projection 34 …… Lip 35 …… Groove 36 …… Rigid elastic annular member

Claims (3)

[Scope of utility model registration request] 1. In an articulated joint pin device for a mechanically actuated link for actuating and maintaining the posture of a work machine such as a power shovel, the pin boss portion of one link and the pin boss portion of the other link, which are joined by a pin, oppose each other. A V-shaped thrust distribution forming portion that distributes thrust in the axial direction and the radial direction is provided between the end faces, and a V-shaped thrust distribution forming portion adapted to the V-shaped thrust distribution forming portion is provided on the inner circumference.
An elastic annular body having a V-shaped surface formed so that the V-shaped angle of the V-shaped surface is larger than the V-shaped angle of the thrust distribution forming portion of the pin boss portion is accommodated in the thrust distribution forming portion. Characteristic work machine link coupling pin device. 2. The coupling pin device for a work machine link according to claim 1, wherein the elastic annular body is formed by embedding a rigid elastic annular member inside an elastic annular body made of a non-metallic material. 3. The coupling pin device for a working machine link according to claim 1, wherein lips for preventing mud intrusion are provided on both side surfaces of the elastic annular body.